You can use any coal, for any tobacco! It is all about the Heat Management! I switch it up, from Al Hambra to Exotica to Akhla to Japanese, just depends on my mood ... but no matter what coal I use I can still get consistent smoke depending on how I setup my bowl "Heat Management"

this is true, but i feel that some QLs and even some natural coals impart flavor onto the bowl that is noticeable and i dont like that =/